<!DOCTYPE html>
<html lang="en">
<head>
  <title>BrowserWindow</title>
</head>
<body>
  <h1>Hello from your BrowserWindow!</h1>
  <button></button>
  <script>
    document.querySelector('Close this window').onclick = () => {
      window.close()
    }
  </script>
</body>
</html>
